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Metal gasket

The two-plate metal gasket structure with abutting sub-beads addresses the limitations of conventional gaskets by enhancing rigidity and alignment, achieving optimal sealing performance for both high-pressure and low-pressure applications.

Inactive Publication Date: 2007-05-03
ISHIKAWA GASKET CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration allows for precise alignment and enhanced sealing performance by adjusting the radial constraint and surface pressures, effectively sealing both high-pressure combustion gases and low-pressure liquids, while maintaining engine integrity.

Problems solved by technology

Therefore, the constituent plates become one or two, usable materials are limited from the aspect of making an engine light, and the kind and number of sealing devices are also limited, which forces to use relatively simplified sealing devices.
Therefore, the design freedom is limited, and it is difficult to provide the optimum sealing performance with respect to the respective holes to be sealed.
Especially, since a high surface pressure is required around the hole for the cylinder bore, in order not to damage the engine members made of a relatively soft aluminum alloy, it is difficult to use a metal base plate having a high rigidity.
On the other hand, there is also a problem that a sufficient rigidity can not be obtained with the conventional shape and arrangement of the bead.
However, in a cylinder head gasket and the like having a fine bead of a width less than 3 mm, the positioning is actually difficult, so that an advanced technique is required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0048] In the first embodiment as shown in FIGS. 1 and 2, the abutment between the first inner peripheral side sub-bead 12 and the second inner peripheral side sub-bead 22 and the abutment between the first outer peripheral side sub-bead 13 and the second outer peripheral side sub-bead 23 are carried out, respectively, such that the respective side portions of mutually inward projecting beads abut against each other.

[0049] While the first main bead 11 and the second main bead 21 normally have different shapes (including sizes), they may be the same shape. When the first main bead 11 and the second main bead 21 have the same shape, since there may be a temperature difference between the first metal base plate 10 and the second metal base plate 20, the sub-beads 12, 13, 22, 23 mainly play a role for mutually positioning the metal base plates 10 and 20 though there is deformation constraint of the main beads 11, 21.

[0050] In FIG. 1, the first main bead 11 and the second main bead 21 h...

second embodiment

[0051] Also, in a second embodiment as shown in FIGS. 3 and 4, a first inner peripheral side sub-bead 12 abuts against a second inner peripheral side sub-bead 22, and a first outer peripheral side sub-bead 13 abuts against a second outer peripheral side sub-bead 23. The abutments are made such that one bead enters the other bead to fit each other.

[0052] In FIG. 3, a first main bead 11 and a second main bead 21 and respective sub-beads 12, 13, 22, 23 are made in a trapezoidal shape. In FIG. 4, the first main bead 11 and the second main bead 21 and the respective sub-beads 12, 13, 22, 23 are made in a circular arc shape.

third embodiment

[0053] In the invention as shown in FIGS. 5 and 6, at least one of a first inner peripheral side sub-bead 12, a second inner peripheral side sub-bead 22, a first outer peripheral side sub-bead 13 and a second outer peripheral side sub-bead 23 is formed of a plurality of beads.

[0054] In FIG. 5, the second outer peripheral side sub-bead is formed of two beads 23 so that the first outer peripheral side sub-bead 13 is sandwiched therebetween. In FIG. 6, further, the first inner peripheral side sub-bead is formed of two beads 12 so that the second inner peripheral side sub-bead 22 is sandwiched therebetween. The number of the sub-beads may be two to three, if there is enough room to provide. There is no specific limitation.

[0055] In all structures of FIGS. 1 through 6, the sub-beads 12, 13, 22, 23 may be provided around the whole circumference in the circumferential direction, or may be discontinuously or intermittently provided. With the length and the position of the sub-beads, the ma...

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PUM

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Abstract

A metal gasket is formed by first and second metal base plates laminated together. The first metal base plate includes one first half bead around the hole, and a first outer sub-bead section. The first outer sub-bead section is smaller than the first half bead, and is provided outside the first half bead. The second metal base plate includes one second half bead around the hole to project in a direction opposite to the first half bead, and a second outer sub-bead section smaller than the second half bead and provided outside the second half bead. The second outer sub-bead section projects in a direction opposite to the second half bead. When the first and second metal base plates are assembled, the first and second half beads face opposite to each other, and the second outer sub-bead section abuts against the first outer sub-bead section.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This is a divisional application of Ser. No. 10 / 804,070 filed on Mar. 19, 2004.BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT [0002] The invention relates to a metal gasket, such as a cylinder head gasket, to be sandwiched between two members, for example a cylinder head and a cylinder block, of an internal combustion engine to seal therearound. [0003] In case joint surfaces of a cylinder head and a cylinder block (cylinder body) of a vehicle are sealed, combustion gas, cooling water, lubricating oil and the like are sealed by sandwiching a cylinder head gasket therebetween. [0004] To meet demands of reducing weight of an engine and a production cost, a cylinder head gasket has been changed to a simple structural cylinder head gasket formed of one or two metal base plates from a metal laminate type gasket including a plurality of metal base plates. Therefore, the constituent plates become one or two, usable materials are limited f...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F02F11/00F16J15/08
CPCF02F11/002F16J15/0825F16J2015/085F16J15/08
Owner ISHIKAWA GASKET CO LTD
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